Expression IQueryPolicy.ApplyPolicy(Expression expression, MemberInfo member)
{
List <LambdaExpression> ops;
if (operations.TryGetValue(member, out ops))
{
var syntax = Database.Provider.GetService <ISyntaxProvider>();
var result = expression;
foreach (var fnOp in ops)
{
var pop = PartialEvaluator.Eval(fnOp);
result = QueryBinder.Bind(Expression.Invoke(pop, result), syntax);
}
var projection = (ProjectionExpression)result;
if (projection.Type != expression.Type)
{
var fnAgg = QueryUtility.GetAggregator(expression.Type, projection.Type);
projection = new ProjectionExpression(projection.Select, projection.Projector, fnAgg);
}
return(projection);
}
return(expression);
}
public Expression ApplyPolicy(Expression expression, MemberInfo member, Func <Expression, Expression> builder)
{
if (_operations.TryGetValue(member, out List <LambdaExpression> ops))
{
var syntax = _provider.GetService <ISyntaxProvider>();
var result = expression;
foreach (var fnOp in ops)
{
var pop = PartialEvaluator.Eval(fnOp);
result = builder(Expression.Invoke(pop, result));
}
var projection = (ProjectionExpression)result;
if (projection.Type != expression.Type)
{
var fnAgg = QueryUtility.GetAggregator(expression.Type, projection.Type);
projection = new ProjectionExpression(projection.Select, projection.Projector, fnAgg, projection.IsAsync, projection.IsNoTracking);
}
return(projection);
}
return(expression);
}